Railroad Archives Online
- ArquivoD0027 - Timothy Miller Collection
- Série003 - Great Northern Railway Company (U.S.)
- Subsérie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 114 mais...
- ItemStruc001533 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001534 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001535 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1965
- ItemStruc001536 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- ItemStruc001537 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1965
- ItemStruc001538 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- ItemStruc001539 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- ItemStruc001540 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- ItemStruc001541 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- 229 mais...